linux-kernel - Question for CXL Drivers and ACPI required for a CXL mem device?

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Message-ID: <CAN7gi4AWhVDFZJ-xzD608bt9ifgo5dFR+OFOdm7=Ci_kpU8Afw@mail.gmail.com>
Date:   Tue, 22 Jun 2021 23:07:27 +0530
From:   samarth saxena <samarth.1986@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: Question for CXL Drivers and ACPI required for a CXL mem device?

Hi All,

I am trying to bring up a system with a CXL Type 3 device using Qemu.
I see that the device is visible in the operating system at the location:
             /dev/cxl/mem0
And a persistent memory attached to the device at
              /sys/bus/cxl/devices/mem0/pmem

But I am unable to understand how to use this memory (pmem).
How can the Linux map this Pmem instance to user space.
Also, CXL device can be a non persistent memory too. How will that be visible?

Which all drivers are necessary to use a CXL Type3 device as a memory
expander? Is there any ongoing development in the kernel?

Regards,
Samarth